Micromechanical modeling of composites with mechanical interface - Part II: Damage mechanics assessment

Continuing the work initiated in the Part I [Bonora N, Ruggiero A. Micromechanical modeling of composites with mechanical interface - Part I: unit cell model development and manufacturing process effects. Compos Sci Technol 2003], in this paper the possibility to account for different damage mechanisms, in the unit cell model (UCM), explicitly developed for composites with mechanical interface, is discussed and results for Ti-15-3/SCS-6 composite laminates are presented. Starting from the analysis of the constituent behaviors a probabilistic model based on Weibull statistics is developed for fiber failure, while a ductile damage model which incorporates stress triaxiality effect has been used for predicting metal matrix progressive failure. Fiber-matrix debonding process has been naturally predicted incorporating the material manufacturing process in the stress/strain history. Numerical results performed with the UCM applied to 0 degrees and 90 degrees unidirectional laminates. loaded both in tension and compression, have been compared with experimental results at both macro- and microscopic scale. (c) 2005 Elsevier Ltd. All rights reserved.